Gigabit Ethernet Train Backbone Node

On-board network router
Gigabit Ethernet Train Backbone Node image

The TBN device is used when many trains must be connected together. TBN has been specially designed to meet the requirements specified by IEC standards for the train Ethernet backbone network (ETBN nodes). Double switched backbone lines protected by a bypass relay ensure high levels of fault tolerance also in the case of a power failure. A couple of TBN can be used together using an active/passive redundant configuration to obtain the maximum level of protection. A routed port is available to connect the backbone to the consist network. TTDP IEC Train inauguration procedure is fully supported. Routing and address translation rules (R-NAT) for multiple consist networks interconnections are automatically defined during train inauguration as well as TRDP interface. On the consist side, the TTCMP© protocol provides automatic main configuration and continuous monitoring giving the customer a way to reduce commissioning and maintenance costs. Designed to operate in harsh environmental conditions typical of rolling stock applications, the TBN can be powered from 24 Vdc to 110 Vdc nominal voltage. Fully EN50155 compliant, it provides the highest level of reliability and robustness required by the railway industry.


Technical specifications


> Governing Standard EN 50155 Railway Applications (Electronic equipment used on rolling stock)

Approvals/Compliance (EMC)

> Electrical fast transient/burst immunity test IEC 61000-4-4 (2004-07)
> Electromagnetic compatibility rolling stock apparatus EN 50121-3-2:2016
> Electrostatic discharge immunity test IEC 61000-4-2 (2008-12)
> Immunity to conducted disturbances, induced by radio-frequency fields IEC 61000-4-6 (2008-10)
> Radiated, radio-frequency, electromagnetic field immunity test IEC 61000-4-3 (2006-02)
> Surge immunity test IEC 61000-4-5 (2005-11)

Approvals/Compliance (Environment)

> Environmental testing - Part 2-1: Tests - Test A: Cold IEC 60068-2-1
> Environmental testing - Part 2-2: Tests - Test B: Dry heat IEC 60068-2-2
> Shock & Vibration EN 61373


> Operating temperature -25 ÷ +55 °C (+70 °C for 10 min. according to EN50155 class T1)
-25 ÷ +70 °C (+85 °C for 10 min. according to EN50155 class T3) [optional]
-40 ÷ +70 °C (+85 °C for 10 min. according to EN50155 class TX) [optional]
> Relative humidity (non condensing) up to 95%
> Storage temperature -40 ÷ +85 °C


> Device bypass for maximum reliability
> Extended RMON counters
> Fallback firmware images for maximum reliability
> In-band (SSH) and out-of-band (console) CLI interface for device management
> In-band and out-of-band firmware upgrade
> RADIUS authentication
> Simple Network Management Protocol (SNMP) v1/v2c/v3
> Train Topology and Configuration Management Protocol (TTCMP©) for automatic device management

Internetworking standards

> IEEE 802.1AB Link Layer Discovery Protocol (LLDP)
> IEEE 802.1D Spanning Tree Protocol
> IEEE 802.1Q Tagged VLANs
> IEEE 802.1w Rapid Spanning Tree
> IEEE 802.1X Port-based network access control
> IEEE 802.3ab Gigabit Ethernet
> IEEE 802.3ad Link Aggregation Protocol (LACP)

Layer 2 features

> 4 output hardware queues for each port
> 5 FE or GbE Ethernet ports (4 switched, 1 routed)
> DSCP/802.1p Class of Service
> Ingress/egress rate limiting
> Link Layer Discovery Protocol (LLDP 802.1ab)
> Strict priority or weighted (WRR) scheduler
> Up to 4096 802.1Q VLANs
> Up to 8192 MAC addresses
> Wire-speed switching

Layer 3 features

> Dynamic routing following train inauguration
> Integrated DNS and DHCP servers
> R-NAT (railway 1:1 NAT)
> Router Redundancy Protocol
> Static routing
> Support for IPv4 protocol
> Train wide standard multicast routing

Physical data

> Degree of protection IP 40
IP54, IP65 [optional]
> Gigabit Ethernet connectors M12, female, 8-ways, X-coding
> Maintenance ports connectors M12, female, 5-ways, A-coding / M12, female, 5-ways, B-coding
> Overall dimensions 207 x 184 x 51 mm (24 Vdc version)
207 x 184 x 73 mm (96/110 Vdc version)
> System status indicators 8 LEDs
> Weight 2,0 Kg (24 Vdc version)
2,5 Kg (96/110 Vdc version)

Power supply

> Max current 0,2 A @ 110 Vdc
0,6 A @ 24 Vdc
> Power consumption 15 W max (24 Vdc version)
22 W max (96/110 Vdc version)
> Power supply class S2, according to EN-50155
> Power supply connector M12, male, 5-ways, A-coding
> Voltage range 14,4 ÷ 40 Vdc (24 Vdc nominal, insulated), according to EN-50155
66 ÷ 165 Vdc (96/110 Vdc nominal, insulated), according to EN-50155
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